AutoCodes – Generic – U1736

U1736 Code - Lack of Acknowledgment For Telltales

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Telltales, Telltales harness is open or shorted, Telltales circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U1736 indicates Lack of Acknowledgment For Telltales.
Common causes: Common causes include Faulty Telltales, Telltales harness is open or shorted, Telltales circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 7,839

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1736 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Telltales has not been received.

OBDII Code U1736 - Lack of Acknowledgment For Telltales - AutoCodes.com — U1736 Code - Lack of Acknowledgment For Telltales

What does this mean?

What are the Possible Causes of the DTC U1736?

Faulty Telltales
Telltales harness is open or shorted
Telltales circuit poor electrical connection

How to Fix the DTC U1736?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1736 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U1736 Code

1. What are common symptoms of OBDII code U1736 (Lack of Acknowledgment For Telltales)?

- Common symptoms include illuminated warning lights on the dashboard, malfunctioning gauges, and loss of communication with certain vehicle systems.

2. What can cause OBDII code U1736 to trigger?

- The code U1736 can be triggered by issues with the instrument cluster, faulty wiring or connectors, or communication problems within the vehicle's network.

3. How can I diagnose the cause of OBDII code U1736?

- To diagnose the cause of U1736, it is recommended to perform a thorough inspection of the instrument cluster, check for loose connections or damaged wiring, and use a diagnostic scan tool to monitor communication between modules.

4. Can a DIYer repair OBDII code U1736 at home?

- Repairing OBDII code U1736 may require advanced diagnostic tools and technical knowledge. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

5. Are there any temporary fixes for OBDII code U1736?

- Resetting the trouble codes using a scan tool may temporarily clear the U1736 code, but it is essential to address the underlying issue to prevent it from reoccurring.

6. Will driving with OBDII code U1736 cause further damage to my vehicle?

- Continuing to drive with OBDII code U1736 may result in inaccurate gauge readings, potential safety hazards, or loss of communication with critical vehicle systems. It is advisable to address the issue promptly.

7. How much does it typically cost to repair OBDII code U1736?

- The cost of repairing U1736 can vary depending on the root cause of the issue, labor rates, and parts needed. It is best to get a professional diagnosis to determine the exact cost.

8. Can a faulty battery cause OBDII code U1736 to appear?

- Yes, a faulty battery or alternator can lead to communication errors within the vehicle's network, triggering OBDII code U1736. It is advisable to check the battery and charging system as part of the diagnosis.

9. Will disconnecting the battery reset OBDII code U1736?

- Disconnecting the battery may reset the trouble codes temporarily, but the underlying issue causing U1736 will likely need to be addressed to prevent the code from reappearing.

10. Is OBDII code U1736 a serious issue that requires immediate attention?

- While OBDII code U1736 may not always indicate a critical problem with the vehicle's operation, it is essential to address it promptly to ensure the proper functioning of the instrument cluster and related systems.